Follow-up from "fix(buttons): Update button states to match specs"

The following discussion from !1502 (merged) should be addressed:

• @jeldergl started a discussion: (+9 comments)

  @tauriedavis we don’t have an example of the states for the dashed button in the UI kit. I noticed here that the states are the same as the default button, but in the current GitLab UI the border on the dashed remains 1px for states. Do you have any thoughts on that?

  I don’t know where we use dashed buttons in the UI, but maybe it does warrant states that still feel dashed or similar?